An offshoot of the zoo's wildly popular Bunk with the Beasts overnight programs for kids and families, this slumber party is just what it's billed to be -- a campout in the Gates Conservation Center for the 21-and-older set, featuring a guided walk through the zoo after hours (during which you'll observe a variety of nocturnal animals, human and otherwise, up close and personal), a couple of meals and a late-night snack (please avoid nibbling your next-door neighbor) and another behind-the-scenes tour in the morning. Singles are encouraged to sign up, though couples are welcome. The next adult night is in June; early signup is a must.